Tshushh!

I feel that the Black grouse (Tetrao tetrix) lek is one of the magnificent and unique displays that nature beholds. When You are used to hiking on little forest or bog trails in early spring, You will instantly recognize a humming like sound, which exact location is almost impossible to tell. It might reach You even from miles away. Then imagine the emotion of being right in the middle of it in the very moment when a dominating male cock falls silent and starts to remind his rivals of his position. All You will hear now is – tshushh!